EP1031054A1 - Procede de montage de lentilles en forme de barres dans un endoscope et endoscope dote de telles lentilles en forme de barres - Google Patents

Procede de montage de lentilles en forme de barres dans un endoscope et endoscope dote de telles lentilles en forme de barres

Info

Publication number
EP1031054A1
EP1031054A1 EP98956908A EP98956908A EP1031054A1 EP 1031054 A1 EP1031054 A1 EP 1031054A1 EP 98956908 A EP98956908 A EP 98956908A EP 98956908 A EP98956908 A EP 98956908A EP 1031054 A1 EP1031054 A1 EP 1031054A1
Authority
EP
European Patent Office
Prior art keywords
tube
rod lens
adhesive
outside
lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98956908A
Other languages
German (de)
English (en)
Other versions
EP1031054B1 (fr
Inventor
Jürgen RUDISCHHAUSER
Ulrich Kehr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Storz SE and Co KG
Original Assignee
Karl Storz SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Karl Storz SE and Co KG filed Critical Karl Storz SE and Co KG
Publication of EP1031054A1 publication Critical patent/EP1031054A1/fr
Application granted granted Critical
Publication of EP1031054B1 publication Critical patent/EP1031054B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/0011—Manufacturing of endoscope parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/002—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor having rod-lens arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2446—Optical details of the image relay

Definitions

  • the present invention relates to a method for mounting at least one rod lens in the interior of a tube belonging to an endoscope by fixing the rod lens in the interior of the tube at at least two axially spaced locations, with the following steps:
  • the invention further relates to an endoscope with a tube, in the interior of which at least one rod lens is fixed at at least two axially spaced apart locations, the rod lens having an outer diameter which is dimensioned such that after inserting the rod lens into the tube between the outside of the tube There is an air gap between the rod lens and the inside of the tube, and the outside of the rod lens is arranged at a defined radial distance from the inside of the tube.
  • Endoscopes are commonly used in surgery to inspect body cavities and hollow organs. Endoscopes have an elongated tubular shaft, in which components of an optical observation system are arranged. Furthermore, further devices, usually a light supply device, and possibly channels for instruments, rinsing liquid or the like are provided in the interior of the shaft. The light is usually supplied via light-conducting glass fibers.
  • the optical system of rigid endoscopes is usually accommodated in a tube lying inside the endoscope shaft .
  • Wesentli ⁇ che components of the optical system, in particular the so-called rod lenses HOPKINS optical microscopes are used in the endo- lenses.
  • the lenses and other components of the optical system such as diaphragms, filters and the like are arranged along the tube shaft axis and have the task of reproducing a clear field of view as large as possible with high resolution and high contrast.
  • the most important prerequisite for this is the precise arrangement of the lenses and the other components of the optical system with one another inside the tube belonging to the endoscope.
  • the relative position of a lens is not variable, but precisely defined. Every shift of the lenses relative to each other leads to a reduced image quality.
  • a precise arrangement is often achieved in that the outside diameter of a rod lens corresponds exactly to the inside diameter of the tube, that is, the lens is accommodated without radial play.
  • Spacers inserted between the lenses including a distal and a proximal end piece, ensure axial positioning and fixing of the lenses or optical components.
  • Endoscopic shafts are very long compared to their diameter, usual diameters are in the range of a few millimeters, the length in the range of several decimeters.
  • bending moments act on the thin and long shafts, which can cause the relatively long rod lenses made of glass materials to break.
  • the rod lenses provided there are connected to each other in the interior of the endoscope shaft by an additional inner tube.
  • This inner tube has longitudinally extending slots in the region in which it bridges the ends of two adjacent, spaced-apart rod lenses.
  • the rod lenses fit without any radial play in the inner tube, i.e. the outside diameter of a lens corresponds to the inside diameter of the inner tube.
  • the rod lenses are either only clamped in the tube or glued with adhesive.
  • an adhesive that can be activated by heat treatment or UV radiation, for example.
  • the possibility of bending the tubular shaft within certain limits without breaking the rod lenses is made possible by the Slots of the inner tube reached.
  • the inner tube can bend slightly in the area of the slits, i.e. in the area between two adjacent rod lenses.
  • Centering elements are known from DE 37 30 094 C2, which are evenly distributed around the circumference of a lens. From DE-A-722 587 two axially spaced centering aids are known and from DD 264 523 AI methods for coaxial gluing of lenses are known.
  • the object is further achieved in the endoscope mentioned at the outset in that the outside of the rod lens is fixed to the inside of the tube by adhesive using adhesive.
  • the tube provided can be the tube shaft of the endoscope itself or another inner tube of the endoscope, which is inserted into the tube shaft of the endoscope only after the lenses have been installed.
  • the positioning of the rod lens centrally in the tube with the aid of the centering aids ensures that there is a uniform air gap, ie a defined radial distance, between the outside of the rod lens and the inside of the tube.
  • centering aids Due to the axial spacing of the centering points at which the centering aids act, tilting of the rod lens within the tube is reliably prevented during assembly, so that the rod lens can be aligned exactly along the optical axis.
  • two, three or even more centering aids can be provided, which are each axially spaced apart.
  • an elastic adhesive connection is established between the outside of the rod lens and the inside of the tube, the adhesive to be used here not completely filling the air gap, but rather being applied only to at least two axially spaced adhesive points.
  • a plurality of adhesive points located at axial distances from one another can be provided.
  • the assembly produced by the method according to the invention from one or more rod lenses in the interior of the tube has the advantage that the rod lenses against axial as well as radial displacement, in particular against, due to the adhesive points Tilting, are secured. Attaching the adhesive to the gluing points ensures that the rod lenses are fixed in the correct position. They therefore deliver a constant image quality.
  • the outside of the rod lens Due to the air gap provided, the outside of the rod lens has no direct contact with the inside of the tube, so that even with high shaking stress (such as when cleaning the endoscope by ultrasound) no abrasion is generated which could adversely affect the optics.
  • the air gap together with the adhesive points according to the invention, ensures the desired flexibility of the assembly of the tube and lens with regard to loads, in particular with regard to bending moments.
  • the air gap together with the gluing points which produce an elastic connection between the lens and the tube, allows only the tube to bend at first. For example, only a small bending moment is exerted on the rod lens, which is made of glass and can therefore only be loaded to a limited extent, which only increases when the tube is bent so large that its inside touches the outside of the rod lens.
  • the tube can thus bend in an arc, since there is a clearance between the rod lens and the tube in the form of the air gap.
  • the air gap together with the gluing points, additionally protects the lens against external forces, since the gluing connection is elastic and can therefore dampen impacts. This significantly reduces the risk of the rod lenses breaking, even if the endoscope is placed down heavily or even falls.
  • the endoscope according to the invention has the advantage that its rod lenses are securely fixed, so that axial or radial displacements are prevented. At the same time, bending of the tubular shaft of the endoscope is possible to a certain extent, namely in that an air gap is provided between the outside of the rod lens and the inside of the tube, which is bridged only by the elastic adhesive points. This allows the tube to bend to a certain extent without the bending moments acting on the rod lens. This prevents the rod lens from breaking when the endoscope is being handled and while it is being cleaned.
  • the object of the invention is thus completely achieved.
  • the exact design of which is provided between the outer side of the rod lens and the inner side of the tube radial distance or air gap can vary depending on the desired application under ⁇ be differently.
  • the person skilled in the art can measure the distance taking into account the length of the rod lens or a plurality of rod lenses, which can also have different lengths within a tube, the material from which the tube is made, and the shape and size of the adhesive points and the adhesive used in each case .
  • the radial distance between the outside of the rod lens and the inside of the tube is selected so that it is in the range of approximately 0.05 to 0.3 mm, preferably in the range of approximately 0.1 mm.
  • both the insertion of the rod lens into the tube and the creation of the adhesive connection are possible without any problems, since there is sufficient scope for insertion without the adhesive points having to bridge an excessive radial distance, as a result of which the adhesive connection could become unstable.
  • the positioning is carried out with at least three centering elements arranged circumferentially offset by 120 ° per centering aid.
  • This measure has the advantage that the rod lens is supported in a particularly secure manner, and thus it is no longer possible to move or tilt the rod lens. It is understood that, depending on the outer diameter of the rod ⁇ lens may be provided as three centering elements also more to the lens support.
  • the centering elements are left in the assembly after the adhesive connection has been made.
  • the centering elements can be provided as spacers, which are in the form of more or less large spacers or radially or axially extending strips. They can consist of any material, for example plastic.
  • elongated, in particular cylindrical, metal or plastic parts are selected for positioning, which are applied axially extending between the inside of the tube and the outside of the rod lens, and these are removed after the adhesive connection has been made or are left in the assembly .
  • radially extending centering pins are used for positioning, which pass through Open openings in the wall of the tube and these are removed after the adhesive connection has been made.
  • This measure has the advantage that the positioning and centering of the rod lens can be carried out particularly precisely, since even after the rod lens has been completely inserted into the interior of the tube, the outside of the rod lens can be accessed directly through the openings in the wall of the tube. In this way, the rod lens can first be brought into its exact axial position, and then its radial or central position can be adjusted.
  • Another advantage of this measure is that the centering elements can be handled from the outside, which makes the centering process considerably easier.
  • At least one opening in the wall of the tube is provided at each gluing point, through which the glue is provided to effect the adhesive connection between the tube and the rod lens.
  • the adhesive only has to be added when the centering process has ended and the rod lens has been precisely positioned inside the tube. It is also advantageous that the adhesive can be applied through the opening at a defined point, so that it is not distributed to undesired points by subsequent further axial or radial displacement of the rod lens and then the tolerance of the assembly of the tube and the rod lens affected by bending loads.
  • three openings are provided which are evenly distributed around the circumference of the tube and through which the adhesive for applying the adhesive connection between the tube and the rod lens and in the form of adhesive spots is applied.
  • This measure has the essential advantage that the rod lens is fixed in the interior of the tube in such a way that axial or radial displacement of the lens is reliably prevented.
  • the flexibility of the assembly remains guaranteed due to the elasticity of the adhesive applied at certain points.
  • This measure is also advantageous in that a pressure equalization between the two axial ends of the tube is possible.
  • longitudinal forces can occur, which strain the adhesive points.
  • the adhesive for producing the adhesive connection between the tube and the rod lens is applied through the opening in the form of an adhesive ring which surrounds the circumference of the rod lens in the region of the adhesive point.
  • This measure has the advantage that the outside of the rod lens is glued extensively to the inside of the tube in the region of the adhesive point and is thus fixed particularly securely. Tilting of the rod lens inside the tube is completely impossible in any direction.
  • the centering pins pass through those openings through which the adhesive also passes is applied, wherein the outer side of the centering pins of an adhesive-repellent material or are coated with egg ⁇ nem such, and these may after Betechnik ⁇ digit of the adhesive bond of the assembly are removed.
  • This measure has the advantage that no additional holes have to be provided in the wall of the tube for applying the adhesive.
  • the centering pins can first be passed through the openings to center the rod lens, and then the adhesive is introduced through the same openings. The adhesive can then harden and the centering pins are only removed from the assembly at this point.
  • centering pins are used which have conical tips.
  • This measure has the advantage that the centering pins can be pulled out of the hardened adhesive particularly easily.
  • adhesive dots are applied as centering elements either on the outside of the rod lens or on the inside of the tube, which expand by activation or also strive for spherical shape due to surface forces.
  • This embodiment has the considerable advantage that the centering elements have a double function on the one hand for centering and on the other hand for producing the adhesive connection to have. This further simplifies the method according to the invention, since neither openings for introducing the centering elements nor for applying the adhesive have to be provided in the wall of the tube.
  • the adhesive spots can be applied at desired positions on the outside of the rod lens or on the inside of the tube, the adhesive applied having a radial dimension which is dimensioned such that a large part of the air gap bridges between the outside of the rod lens and the inside of the tube when the rod lens is inserted into the tube.
  • the rod lens is then "automatically” centered due to the sublime glue points.
  • the between the glue point and e.g. the inside of the tube remaining space is only fulfilled by activating the adhesive due to its expansion, so that in the end a firm connection between the outside of the rod lens and the inside of the tube is established by means of the adhesive point.
  • the adhesive is preferably activated by heat treatment.
  • Akti ⁇ may, however, also take place by four UV irradiation or other appropriate measures.
  • the adhesive dots are surrounded by a material that serves as a barrier.
  • This material can surround the adhesive dots, for example in a ring, and an adhesive-repellent material can also be used.
  • This measure has the advantage that the expansion of the adhesive is limited laterally after its application and is essentially only possible in the radial direction.
  • elastic centering elements are attached to the outside of the rod lens and are glued to the inside of the tube.
  • This measure has the advantage that the centering elements are themselves designed as part of the elastic adhesive connection.
  • the elastic centering elements are then glued to the inside of the tube and the overall elastic adhesive connection between the inside of the tube and the outside of the rod lens is thereby achieved.
  • the adhesive connection is applied adjacent to the thickening.
  • bone lenses which are usually provided with radial thickening at the end.
  • the radial dimension of the lens is larger than between the thickening.
  • Figure 1 is a partially broken side view of an endoscope according to the invention.
  • FIG. 2 shows a partial longitudinal section of an endoscope according to FIG. 1, specifically in the area of an assembly consisting of a tube and a rod lens;
  • FIG. 3 shows a cross section along the line III-III in Fig. 2.
  • FIG. 4 shows a section corresponding to FIG. 2, the tube being bent due to loads;
  • FIG. 5 shows a detail from a further embodiment of an assembly according to the invention in longitudinal section
  • FIG. 11 shows a detail from an alternative embodiment of an assembly according to the invention in longitudinal section
  • Fig. 12 is a section along the line XII-XII of Fig. 11;
  • FIG. 13 shows an enlarged detail of the embodiment from FIG. 11, specifically in the region of an adhesive point before activation of the adhesive;
  • FIG. 15 shows a section corresponding to the illustration in FIG. 13 of a further embodiment before activation of the adhesive
  • FIG. 16 is the section of Figure 15 after activation of the adhesive substance ⁇ .
  • FIG. 17 shows a section of another embodiment with elastic centering elements that is comparable to the illustration in FIG. 13;
  • Fig. 19 is a partial longitudinal section of an endoscope in which a bone lens is mounted.
  • FIG. 10 which is designated in its entirety by reference number 10, the method according to the invention for mounting a rod lens 12 in the interior of the endoscope 10 was used.
  • the endoscope 10 has an elongated tubular shaft 14, on the proximal end of which a housing 16 is arranged.
  • An eyepiece 18 with an eyepiece cup 20 is provided in the housing 16.
  • An optical system, to which the rod lens 12 also belongs, is accommodated in the tubular shaft 14 of the endoscope 10. Together with other lenses, diaphragms, filters and the like (not shown here), the optical system serves to bring an image that can be detected at the distal end to the proximal end.
  • a light guide system in the form of glass fibers is also arranged in the tubular shaft 14, which is not specified here. NEN laterally from the housing 16 lug 22 are connected to a light source, not shown here.
  • An inner tube 24 is arranged inside the tubular shaft 14, within which the rod lens 12 and the further components of the optical system, not shown, are arranged.
  • a window 26 at the distal end of tube 24 forms a tight seal on the distal side of tube 24, via which the image information enters the optical system. If the tube 24 cannot be hermetically sealed due to the adhesive or adjustment openings mentioned below, an intermediate tube (not shown here) can be provided, which is then sealed off by the window 26 instead of the tube 24.
  • the outer diameter A of the rod lens 12 is smaller than the clear inner diameter B of the tube 24, so that there is a radial distance or air gap 34 between the outside 30 of the rod lens 12 and the inside 32 of the tube 24.
  • the outside 30 of the rod lens 12 has no direct contact with the inside 32 of the tube 24, but is fixed centrally within the tube 24 by means of adhesive dots 36 and 38.
  • the rod lens 12 is attached via a total of four adhesive points 36.
  • two adhesive dots 36 are evenly distributed around the circumference of the rod lens 12, that is to say arranged offset by 180 °.
  • the two adhesive dots 36 and 38 are axially spaced apart.
  • the rod lens 12 is fixed in the correct position in the interior of the tube 24 without the rod lens 12 being able to move or tilt axially.
  • FIG. 4 The flexibility of the assembly against bending loads caused by the interaction of the air gap 34 with the adhesive points 36 and 38 can be seen from FIG. 4. There it is shown that an arcuate bending of the tube 24 is possible to a certain extent without the rod lens 12 being subjected to a high bending load. Because of the air gap 34 and the elasticity of the adhesive points 36 and 38, it is in fact possible for the tube 24 to bend over the entire length of the rod lens 12, the adhesive points 36 and 38 being able to deform to a certain extent.
  • FIGS. 5 to 10 A further embodiment of the assembly of the tube 24 and the rod lens 12, on the basis of which the method according to the invention for mounting these components is to be explained, is shown in FIGS. 5 to 10.
  • the rod lens 12 is connected at two axially spaced apart locations by three adhesive points 36 and 38 distributed around the circumference of the rod lens in the interior of the tube 24.
  • three circumferentially distributed adhesive points 36 and 38 allow a particularly secure fixation of the rod lens in the interior of the tube.
  • the rod lens 12 To mount the rod lens 12, it is first inserted into the tube 24, which is easily possible due to the air gap 34, which is in the range of approximately 0.1 mm. To position the rod lens 12 centrally in the interior of the tube 24, i.e. In order to produce a defined distance between the outside 30 of the rod lens and the inside 32 of the tube, centering aids are provided, the various embodiments of which are shown in FIGS. 7 to 10.
  • centering elements in the form of centering pins 40 are inserted through openings 42 in the wall of the tube 24.
  • the three centering pins 40 which are evenly distributed around the circumference of the rod lens 12 and which engage through the openings 42 in the outside 30 of the rod lens 12. fen, form a centering aid.
  • a precise positioning of the rod lens to allow 12 are two spaced beab ⁇ stan finished centering provided axially.
  • the adhesive connection is established between the outside 30 of the rod lens 12 and the inside 32 of the tube 24. This is done through further openings 44, which are also are evenly distributed around the circumference of the rod lens 12, adhesive in the form of adhesive points 36, 38 applied. Each adhesive dot 36 or 38 fills the opening 44 in the wall of the tube 24 and bridges the air gap 34 between the outside 30 of the rod lens 12 and the inside 32 of the tube in a limited area.
  • the centering pins 40 can be removed from the openings 42 in the wall of the tube 24.
  • This assembly can then be inserted into the tubular shaft 14 of the endoscope 10 shown in FIGS. 5 and 6.
  • FIG. 8 Another embodiment of the centering aid is shown in FIG. 8.
  • Centering pins 46 shown here engage the lens through the openings 44 provided for applying the adhesive. After the rod lens 12 has been positioned centrally in the interior of the tube 24 with the aid of the centering pins 46, adhesive in the form of adhesive dots is applied through the openings 44. This is easily possible, since the centering pins 46 in the in Fig. 8 shown embodiment are thinner than the openings 44, they also have conical tips 48. So that the centering pins 46 can be easily removed again after the adhesive has hardened, they can consist of an adhesive-repellent material or are coated with such a material.
  • the centering aids provided in FIGS. 9 and 10 do not necessarily have to be removed from the assembly after assembly.
  • the centering aids are in the form of three spacers 50 distributed circumferentially around the rod lens 12, which can be provided either as spacers or as axially extending strips, which are made, for example, of plastic.
  • the spacers 50 can be inserted into the tube 24 at the same time as the lens. In this embodiment, removal of the spacers 50 after the attachment of the adhesive dots 38 is no more necessary than the provision of openings 44 for the centering aids in the wall of the tube 24.
  • the centering aid shown in FIG. 10 is in the form of axially extending, elongated cylindrical bodies 52 which are evenly distributed around the circumference of the rod lens 12. After application and hardening of the adhesive dots 38, the cylindrical bodies 52 can either remain in the assembly or can be pulled out.
  • FIGS. 11 to 16 An alternative embodiment of the assembly method according to the invention is shown in FIGS. 11 to 16. With this configuration, it is not necessary to make openings in the wall of the Provide tube 24.
  • the rod lens 12 is centered by adhesive dots 54 and 56 itself.
  • an adhesive is used which can expand by activation or can also take the form of a sphere.
  • Adhesive dots 54 and 56 can thus first be applied to the outside 30 of the rod lens 12, even before the rod lens 12 has been inserted into the tube 24.
  • the distribution of the adhesive points 54 and 56 is arbitrary, but must take place at at least two axially spaced locations. In order to allow the rod lens to be fixed as securely as possible, three adhesive points 54, 56 distributed around the circumference of the rod lens 12 are preferably attached at two axially spaced locations.
  • the rod lens 12 After applying the adhesive dots 54, 56 on the outside 30 of the rod lens 12, the rod lens 12 is inserted into the tube 24.
  • the adhesive is then activated, for example, by heat treatment, causing it to expand or deform, for example striving to be spherical due to surface forces, see FIG. 14.
  • the gap 58 is filled with adhesive in the region of the adhesive point 56, and the adhesive point 56 bonds the inside 32 of Tube 24 with the outside 30 of the rod lens 12 and thus creates a firm connection.
  • the adhesive dots can be surrounded by a barrier, for example in the form of a spacer ring 60, as shown in FIGS. 15 and 16.
  • the spacer ring 60 prevents the adhesive from spreading laterally during activation over larger areas of the outside 30 of the rod lens 12, but rather can expand essentially in the radial direction.
  • an adhesive point 56 establishes the connection between the inside 32 of the tube 24 and the outside 30 of the rod lens 12.
  • elastic centering elements 66 are applied to the outside of the rod lens 12, which can either be elongated or annular, as described above. These elastic centering elements serve to position the lens 12 in the tube 24 in the correct position.
  • the adhesive 68 is introduced via an opening 44 in the tube 24, which then forms a connection between the elastic centering element 66 and the inside 32 of the tube 24. This also results in an overall elastic adhesive connection between the outside of the rod lens 12 and the inside 32 of the tube 24.
  • FIG. 19 shows an embodiment of a rod lens as a bone lens 70, which is provided with thickened portions 72 at the end is.
  • the bone lens 70 is connected to the tube 24 via adhesive points 74 and 76, and thus the outside of the bone lens 70 is connected to the inside 32 of the tube 24 via an elastic adhesive connection. 4, it can be seen from this that the essential bends take place between the adhesive points.
  • the adhesive dots 74 and 76 lie adjacent to the thickenings 70 and 72, a relatively strong bending of the tube 24 can also take place between the adhesive dots 74 and 76 and then accordingly between the thickenings 72, such as that is indicated in Fig. 4.

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Abstract

L'invention concerne un procédé permettant le montage d'au moins une lentille en forme de barre (12) dans un tuyau (24) appartenant à un endoscope par fixation de cette lentille (12) dans le tuyau (24) avec de la colle. Ce procédé consiste - à sélectionner le diamètre extérieur de la lentille (12) de telle façon qu'une fente circonférentielle soit aménagée entre le côté extérieur (30) de la lentille (24) et le côté intérieur (32) du tuyau (24) une fois la lentille (12) insérée dans le tuyau (24); - à positionner le côté extérieur (30) de la lentille en forme de barre (12) à une distance radiale déterminée du côté intérieur (32) du tuyau (24) par au moins deux auxiliaires de centrage qui s'engagent au niveau d'au moins deux points du côté extérieur (30) de la lentille (12), axialement distants l'un de l'autre. Chaque auxiliaire de centrage présente des éléments de centrage qui sont régulièrement répartis sur la circonférence de la lentille (12). Le procédé consiste enfin à réaliser une liaison adhésive élastique entre le côté extérieur (30) de la lentille (12) et le côté intérieur (32) du tuyau (24) au niveau d'au moins deux points de collage axialement distants l'un de l'autre. L'invention concerne également un endoscope doté d'un tuyau (24) et d'une lentille en forme de barre (12) qui peut être montée selon ce procédé.
EP98956908A 1997-11-15 1998-11-12 Procede de montage de lentilles en forme de barres dans un endoscope et endoscope dote de telles lentilles en forme de barres Expired - Lifetime EP1031054B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19750685 1997-11-15
DE19750685A DE19750685C2 (de) 1997-11-15 1997-11-15 Verfahren zum Montieren von Stablinsen in einem Endoskop sowie Endoskop mit solchen Stablinsen
PCT/EP1998/007252 WO1999026096A1 (fr) 1997-11-15 1998-11-12 Procede de montage de lentilles en forme de barres dans un endoscope et endoscope dote de telles lentilles en forme de barres

Publications (2)

Publication Number Publication Date
EP1031054A1 true EP1031054A1 (fr) 2000-08-30
EP1031054B1 EP1031054B1 (fr) 2003-05-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98956908A Expired - Lifetime EP1031054B1 (fr) 1997-11-15 1998-11-12 Procede de montage de lentilles en forme de barres dans un endoscope et endoscope dote de telles lentilles en forme de barres

Country Status (4)

Country Link
US (1) US6201649B1 (fr)
EP (1) EP1031054B1 (fr)
DE (2) DE19750685C2 (fr)
WO (1) WO1999026096A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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EP1031054B1 (fr) 2003-05-21
DE19750685C2 (de) 2003-08-14
DE19750685A1 (de) 1999-06-10
WO1999026096A1 (fr) 1999-05-27
DE59808493D1 (de) 2003-06-26
US6201649B1 (en) 2001-03-13

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